Prevalence of a single fish-pathogenicSaprolegnia sp. clone in Finland and Sweden

[摘要] ABSTRACT: Thirty-one isolates of Saprolegnia sp., most originating from infected salmon or trout, were characterised genetically and physiologically. The majority (6 of 31) of the isolates from several widely separated geographical locations wasfound to be genetically almost identical as assessed by RAPD-PCR. The remaining isolates belonged to 3 different groups with 1 to 3 representatives each. It is suggested that the first group of isolates represents a virulent form of the organism that hasbeen widely spread by clonal propagation. The ability to repeated zoospore emergence, as an alternative to direct germination, seems to characterise specific Saprolegnia genotypes that may have adapted to certain hosts.

[学科分类] 生物科学（综合）

[关键词] Saprolegnia;Saprolegniosis;Fish disease;Random amplification of polymorphic DNA RAPD;Repeated zoospore emergence